Pump for liquid-sprayers.



L. A. ASPINWALL..

PUMP FOR LIQUID SPRAYERS. PPLIOATION FILED Jtmna, 1909.

Patent-,ed June 6,1911

Invia LEWISv AUGUSTUS ASPINWALL' To all whom it may concern:

UNITED STATES 1fartificial" OFFICE.

oF JAcxso'N, lnclamn,` AssIGNon' To ASPINWALI.

MANUFACTURING C0., F JACKSON, MICHIGAN, A CORPORATION .QF MICHIGAN.

rum yroze. LmUriD-srmnmns.

Be it known that I, LEWIS AUGUSTUSv ASPINWALL, a citizen of the United States,

a leakage of the residinv at Jackson, in the county of Jackson and State of Michigan, have'invented. an Improvement in Pumps for Liquid- Sprayers, of which the following is a speciiication. l

In the use of liquid sprayin devices particularly for treating pot-ato light, strong solutions are necessarily employed, which it has been found have a disastrous effect upon the piston packings o f the pump used with the liquid spraying devices, particularly so while the pum is in a state of rest; 'for these strong so utions harden and warp the packings, having a shriveling effect thereon, `or in other words, causing the same to shrink away from-the cylinder, resulting in pump. This leakage makes necessary the removal of the piston and re-packing the same, all of which it is rthe object of my invention to relieve and make less frequen .In the device of my invention the packing can be tightened up to prevent leakage without removing the piston from the cylinder or disconnecting any parts of the structure, and the renewal of the packingis readily and quickly accomplished.

The pump cylinder is open at one end and the piston preferably tubular and projecting. A cup-leather surrounds the inner end of the piston against a liange thereof. A rub- `-ber collar surrounds the saine end of the "piston and comes against the cup-leather.

A"`-rod passes through the tubular plston and I Aprqvide a hollow cup-shaped head bearlng against the outer face of the rubber collar which is connected to one end of the rod and on the other end of the rod I providea nut and washer which bear against the end of the tubular piston and by the tightening of which the "cad is forced against the rubber collar which; is expanded, in. turn expandin the piston outward against the inner surace of the cylinder and so effecting a tight joint of th\packing against the inner surface` of the cylinder. The desired` extent 4of pressure is easily obtained" and readily applied for the reason that the tightening up is on the ex osed end of the tubular piston outside of t e cylinder. l

In the drawing, Figurel` 1s 'a plan view generally illustrating the features of my 1n- Speci-catlon of Letters Patent. p Application filed :une s, 1909. serial No. `499,969. p

'cup-leather or surface leather f and make 'Patented Junge, 1911.

vention, and Fig. 2 is a longitudinal and central section 1n large size showing the mai-n portion illustrated in Fig. 1.

In the` drawing, for the purposeof illustration, I have shown two' cylinders and prefer in the device to which my invention" is particularly adapted, to employ" two cylinders although I do not limit myself in this respect as the particular features of the invention are applicable to apum having p nly one cylinder as well-as two cy inders in a. b represent the cylinders. These are illustrated as open-ended. The pistonseach comprise a tubular stem part e and a ange el and tubular end. The tubular stem arts e extend out beyond' the open ends o the cylinders.

The piston-packing or cup-leather` f of any suitable or desired materlal is L-shaped as usual, it surrounds the tubular end of the piston with one side bearing against a face of the fiange e1 and against the mner surfacel of the cylinder. A rubber collar g surrounds the tubular stem-end fitting the same and` coming within the piston-packing or f and against the opposite side thereof, 'and I provide a 'hollow cup-shaped head 71, with a circumferential flange which agrees substantially in diameter with the rubbercollar g and which bears upon the outer-end of-the same. The inner diameter of this hollow cup-shaped head h A is fully as great as the tubular stem-end.

A rod 'i extends through the tubular piston and the same at one end engages the head h atan interiorly opening. This rod at the other end passes out of the-end of the tubular istonand is provided with a nut k and was er k1 adapted to bear with force upon the end face of the tubular piston.

To expand the piston-packing or cup-- leather` f, the rubber collar g within the' same 1s expanded by drawing on the rod z' .and head bfyltightenin the nut Je at the outer and rea y accessib e end ofthe tubular sleeve e, and as the circular faces of the hea-d. and the rubber collar g agree, these parts are directly acted-uponby the tightenmg of the nut ls to expand the rubber collarl and through it the plston-packing or cupthe pump fully operative. I.have shown in the cylindrical body c interposed between the threaded central drawing a central' I open-ended cylinders a b and an air cham? most suitable for employment in the diierent spraying devices such as .I have shown and'described in Letters Patent previously granted to me as followsz-Na 653,333, grantedJuly 10, 1900; No. 717 ,314, granted December. 30, 1902; No. 828,175, granted August 7, 1906 and No. 864,501, granted July 27, 1907. I have also shown screw plugs Z in the center of the cylindrical body c providing access to the valves contained Within this cylindrical body which however, are not shown and form no part of my present invention which relates articularly to the tubular piston, its cupeather and means for expanding the same against the inner surface of the open-ended cylinder so as to provide a tight joint for pumping purposes.

I claim as my invention:

1. The combination with an open ended pump lcylinder, of a piston comprlsing a tubular stem-part extending beyond the open end of the cylinder and having aange near the inner end, a piston-packing of cup form surrounding the tubular stem between the flange and the inner end and bearing upon the flange, a rubber collar also surrounding this tubular stem within the piston-packing of cup form, a cup-shaped hollow head having a circumferential surface bearing against the outer face of the rubber collar, and means extending to the outer free end of the tubular stem part for applying pressure to expand the rubber collar and so expand the piston-packing.

2. The combination with an open ended pump cylinder, of a piston comprising a tubular stem-part extending beyond the open end of the cylinder and having a flange nearl` the inner end, a piston-packing of cup form surrounding the tubular stem between the flange and theinner end and bearing upon the flange, a rubber collar also surrounding this tubular stem within the piston-packing of cup form, a'cup-shaped hollow head having a circumferential surface bearing against the outer face of the rubber collar, and a rod passing through the tubular stem, at one end connected to said hollow head and at the other end extending out of the tubular stem and a nut thereon for applying pressure to expand the rubber c`Ollar and so expand the piston packing.

Signed by me this 28th day of May, 1909.

LEWIS AUGUSTUS ASPINWALL.

Witnesses:

C. G. RAWLEY, GEO. N. WHITNEY. 

